20121090149 has 2 divisors, whose sum is σ = 20121090150. Its totient is φ = 20121090148.

The previous prime is 20121090137. The next prime is 20121090179. The reversal of 20121090149 is 94109012102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19679039524 + 442050625 = 140282^2 + 21025^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121090149 - 2⁸ = 20121089893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121090179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060545074 + 10060545075.

It is an arithmetic number, because the mean of its divisors is an integer number (10060545075).

Almost surely, 2^20121090149 is an apocalyptic number.

It is an amenable number.

20121090149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121090149 is an equidigital number, since it uses as much as digits as its factorization.

20121090149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 20121090149 in words is "twenty billion, one hundred twenty-one million, ninety thousand, one hundred forty-nine".